@import url('https://fonts.googleapis.com/css2?family=Muli&display=swap');

:root {
  --line-border-fill: #3498db;
  --line-border-empty: #e0e0e0;
}

* {
  box-sizing: border-box;
}

body {
  display: grid;
  justify-content: center;
  place-content: center;
  margin: 0;
  height: 100vh;
  font-family: 'Muli', sans-serif;
  background-color: #f6f7fb;
  overflow: hidden;
}

.container {
  text-align: center;
}

.progress-container {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
  min-width: 100%;
  width: 350px;
}

.circle {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 30px;
  height: 30px;
  color: #999;
  background-color: #fff;
  border-radius: 50%;
  border: 3px solid var(--line-border-empty);
  transition: border 0.4s ease;
  &.active {
    border-color: var(--line-border-fill);
    transition: border 0.4s ease 0.3s;
  }
}

.btn {
  margin: 5px;
  padding: 8px 30px;
  font-family: inherit;
  font-size: 14px;
  color: white;
  background-color: var(--line-border-fill);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  &:active {
    transform: scale(0.98);
  }
  &:focus {
    outline: 0;
  }
  &:disabled {
    background-color: var(--line-border-empty);
    cursor: not-allowed;
  }
}